Is the word “Allah” exclusive to Muslims?

No. To begin with, one cannot censor the use of words that other people use unless the usage is defamatory, slanderous, libelous or profane.

Secondly, the word “Allah” is simply the Arabic word for God. God uses it in the Quran to refer to Himself because the Quran is revealed in the Arabic language, not because that is His name. God does not have a name. He does not need one. You and I have names because there are many creatures that are just like us, so a name is necessary to distinguish us from others. But there is only one God.

Arab Christians and Jews call God “Allah.”

It is true that many Islamophobes have been abusing the word “Allah”, but these folks do not realize that, by doing so, they are abusing the same God they believe in!

When God says in the holy Quran that He has beautiful “names” that we should use when we call upon Him (7:180), He is referring to His attributes, such as Ar-Rahmaan (The Beneficent), Al-Ghafoor (The Much-Forgiving), At-Tawwaab (The Oft Accepting of repentance). One of those attributes is Allah, which means The God.